thinking of making another rc

[stampy]

this time i wont to make a 1/10 scale 4wd truck to replace my rs4 mt when i cant find parts for it any more :( . but any way im thinking 2 stampede trannys on a custom chassie. im going to start from scratch with the trannys, i know you can make them tuff with the steel diff and aluminum idler but what about the other gear should i just go with a stock one? whats the stock one made of?